Japanese Imperial Family New Year Greeting at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

Japan's Crown Princess Masako waves during Emperor Akihito's birthday public appearance with other members of the Imperial family at the Imperial Palace in Tokyo on December 23, 2018.

Crown Princess Masako waves to media reporters on arrival at the Imperial Palace on Emperor Akihito's 85th birthday on December 23, 2018 in Tokyo, Japan.

Japanese Crown Prince Naruhito (L), Crown Princess Masako (R) and their daughter Princess Aiko arrive at the Imperial Palace in Tokyo to attend a dinner to celebrate Emperor Akihito's 85th birthday on Dec. 23, 2018.

Crown Prince Naruhito and his wife Crown Princess Masako attend a New Year's ceremony at the Imperial Palace in Tokyo on Jan. 1, 2019.

Japan's Crown Prince Naruhito (2nd R) and Crown Princess Masako (R) bowing to Emperor Akihito and Empress Michiko during a ceremony to celebrate the new year at the Imperial Palace in Tokyo.

Japan's Crown Princess Masako waves to well-wishers from the balcony of the Imperial Palace in Tokyo on January 2, 2019 during the New Year's greetings.

Japanese Crown Prince Naruhito and Crown Princess Masako arrive at the Imperial Palace in Tokyo to offer New Year's greetings to well-wishers on Jan. 2, 2019.

Japanese Emperor Akihito (2nd from L) and his successor, Crown Prince Naruhito (L), are pictured, alongside Empress Michiko (R) and Crown Princess Masako during the emperor's New Year's greeting ceremony in Tokyo on Jan. 2, 2019. The emperor is scheduled to abdicate on April 30.

Japanese Crown Prince Naruhito (L), Crown Princess Masako (R) and their daughter Aiko arrive at the Imperial Palace in Tokyo on Jan. 2, 2019.

Japanese Emperor Akihito (Center L), Empress Michiko (Center R), Crown Prince Naruhito (2nd from L), Crown Princess Masako (L), Prince Fumihito (2nd from R) and Princess Kiko attend the emperor's New Year's greeting ceremony at the Imperial Palace in Tokyo on Jan. 2, 2019.

Crown Princess Masako is seen on the 30th anniversary of the death of Emperor Showa at the Imperial Palace on January 7, 2019 in Tokyo, Japan.

Crown Prince Naruhito (L), Crown Princess Masako (R) and their daughter Princess Aiko head to the Imperial Palace in Tokyo on Jan. 1, 2019, to attend a New Year's ceremony.

Crown Prince Naruhito, Princess Aiko and Crown Princess Masako are seen on arrival at the Imperial Palace to celebrate Emperor Akihito's 85th birthday on December 23, 2018 in Tokyo, Japan.

Crown Prince Naruhito and Crown Princess Masako are seen on arrival at the Imperial Palace to attends the 'Enkai-no-Gi' luncheon party celebrating Emperor Akihito's 85th birthday on December 23, 2018 in Tokyo, Japan.

Crown Princess Masako waves to media reporters on arrival at the Imperial Palace on Emperor Akihito's 85th birthday on December 23, 2018 in Tokyo, Japan.

Crown Princess Masako waves to media reporters on arrival at the Imperial Palace on Emperor Akihito's 85th birthday on December 23, 2018 in Tokyo, Japan.

Emperor Akihito, standing beside Empress Michiko, waves to well-wishers during his final New Year Greeting at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

Emperor Akihito, standing beside Empress Michiko, waves to well-wishers during his final New Year Greeting at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

(L to R) Crown Princess Masako, Crown Prince Naruhito, Emperor Akihito and Empress Michiko stand during the New Year Greeting session at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

(L to R) Crown Princess Masako, Crown Prince Naruhito, Emperor Akihito, Empress Michiko, Prince Akishino, Princess Kiko, Princess Mako and Princess Kako of Akishino stand on the balcony during the New Year Greeting session at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

 (L to R) Princess Akiko of Mikasa, Princess Nobuko of Mikasa, Crown Princess Masako, Crown Prince Naruhito, Emperor Akihito, Empress Michiko, Prince Akishino, Princess Kiko, Princess Mako, Princess Kako of Akishino, Princess Hisako and Princess Tsuguko of Takamado stand on the balcony during the New Year Greeting session at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

(L to R) Princess Kiko, Princess Mako and Princess Kako of Akishino wave to well-wishers on the balcony during the New Year Greeting session at the Imperial Palace on January 02, 2019 in Tokyo, Japan.

Emperor Akihito and Empress Michiko are greeted by Crown Prince Naruhito and Crown Princess Masako during the 'Shinnen-Shukuga-no-Gi' New Year Celebration Ceremony at the Imperial Palace on January 01, 2019 in Tokyo, Japan.

Emperor Akihito and Empress Michiko are greeted by Crown Prince Naruhito, Crown Princess Masako, Prince Akishino and Princess Kiko of Akishino during the 'Shinnen-Shukuga-no-Gi' New Year Celebration Ceremony at the Imperial Palace on January 01, 2019 in Tokyo, Japan.

Crown Prince Naruhito, Princess Aiko and Crown Princess Masako are seen on arrival at the 'Shinnen-Shukuga-no-Gi' New Year Celebration Ceremony at the Imperial Palace on January 01, 2019 in Tokyo, Japan.

Emperor Akihito leaves the room with Empress Michiko after the 'Chakai-no-Gi' tea party on his 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Akihito toasts glass with Empress Michiko, Crown Prince Naruhito and Prince Akishino on his 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Emperor Akihito attends the 'Chakai-no-Gi' tea party celebrating his 85th birthday with Empress Michiko, Crown Prince Naruhito, Prince Akishino, Princess Kiko of Akishino, Princess Mako of Akishino, Princess Kako of Akishino, Princess Nobuko of Mikasa, Princess Akiko of Mikasa, Princess Yoko of Mikasa, Princess Hisako of Takamado and Princess Tsuguko of Takamado at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Emperor Akihito addresses during the 'Enkai-no-Gi' luncheon party marking Akihito's 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Emperor Akihito (3rd R) addresses while Empress Michiko, Crown Prince Naruhito, Crown Princess Masako, Prince Akishino and Princess Kiko of Akishino listen during the 'Enkai-no-Gi' luncheon party marking Akihito's 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Emperor Akihito (3rd L) waves to well-wishers along with Empress Michiko, Crown Prince Naruhito, Crown Princess Masako, Prince Akishino and Princess Kiko of Akishino on his 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Princess Mako of Akishino and Princess Kako of Akishino wave to well-wishers on Emperor Akihito's 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Princess Mako of Akishino and Princess Kako of Akishino wave to well-wishers on Emperor Akihito's 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Princess Mako and Princess Kako of Akishino talk with guests during the 'Chakai-no-Gi' tea party celebrating Emperor Akihito's 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.

Emperor Akihito leaves the room with Empress Michiko after the 'Chakai-no-Gi' tea party on his 85th birthday at the Imperial Palace on December 23, 2018 in Tokyo, Japan.